Right, more bleach! My CYA is 80 and my FC is 8, before a party I add a jug of 8.25%which adds 4 ppm to the pool. Sometimes, I'll add two jugs if there are extra people, kids or we plan to swim all day and into the evening. More FC will oxidize CCs faster. And remember, it is safe to swim when FC is above minimum and up to shock level for your CYA, [FC/CYA][/FC/CYA]. As soon as FC drops below minimum the kill rate for bacteria and pathogens is too slow to fully prevent person to person disease transmission, especially in kids. Bacteria colonies can double in size in an hour if they are not killed quickly enough.